{
  "abstract": "We investigate the cosmological implications of the bulk viscosity within the framework of $f(R,T)$ gravity by considering the linear model $f(R,T)=R+2λT$, where $λ$ characterizes the matter--geometry coupling. Assuming a homogeneous and isotropic Friedmann--Lemaître--Robertson--Walker Universe, we derive analytical expressions for the Hubble parameter in two different scenarios: model A, corresponding to a pressureless viscous fluid ($ω=0$), and model B, where the equation of state (EoS) parameter is treated as a free parameter. The cosmological parameters are constrained through a Markov Chain Monte Carlo analysis. The results show that both viscous $f(R,T)$ models provide an excellent description of the current expansion history and remain compatible with the combined observational data. Model A is slightly favored over the standard cosmological model ($Λ$CDM) according to AICc, reflecting the improved fit achieved with only one additional free parameter. In contrast, the BIC continues to favor the simpler $Λ$CDM model owing to its stronger penalty on model complexity. Although model B yields the lowest minimum $χ^2$, the improvement is too small to justify the introduction of an additional free parameter, resulting in a statistical performance comparable to $Λ$CDM according to the AICc but less favorable according to the BIC.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.00022",
  "author_total": 4,
  "authors": [
    {
      "name": "Omayma Saddiki"
    },
    {
      "name": "Safae Dahmani"
    },
    {
      "name": "Taoufik Ouali"
    },
    {
      "name": "Abdelkarim Oukouiss"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/19qxwbnbtq7fy.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.00022",
  "fulltext_url": null,
  "id": "19qxwbnbtq7fy",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.00022",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.gen-ph"
    ],
    [
      "openalex",
      "3103|Cosmology and Gravitation Theories"
    ]
  ],
  "openalex": "W7206196646",
  "pdf_url": "https://arxiv.org/pdf/2609.00022",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/19qxwbnbtq7fy.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:00Z",
      "native_id": "2609.00022",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.00022"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Cosmology and Gravitation Theories",
      "subfield": "cosmology"
    }
  ],
  "title": "Testing the bulk viscosity within the f(R,T) gravity in light of DESI-DR2 observations",
  "title_text": "Testing the bulk viscosity within the f(R,T) gravity in light of DESI-DR2 observations",
  "type": "preprint",
  "updated_at": "2026-10-30T12:18:00Z",
  "url": "https://research.draconitic.com/paper/19qxwbnbtq7fy",
  "venue": "arXiv",
  "versions": []
}